如何将Rails应用作为Weebly扩展共享同一域名？Heroku部署求指导

Hey Mike, great question! Let’s break down both your options for hosting your Rails app alongside your Weebly site on the same domain, since you’re deploying to Heroku. Each approach has its pros and cons, so let’s walk through them step by step.

This is the simpler of the two options, since both Weebly and Heroku handle subdomain configuration smoothly. Here’s how to set it up:

• Step 1: Add a DNS record in Weebly
  Head to your Weebly domain management dashboard. Look for the DNS settings section, then add a new CNAME record:

  • Hostname: welcomerailsapp
  • Value: The Heroku-provided target for your app. You’ll get this after running the Heroku command below, but it’ll look something like yourapp.herokudns.com (Heroku’s recommended target for custom domains).

• Step 2: Configure the custom domain in Heroku
  Open your terminal, navigate to your Rails app’s directory, and run:

  heroku domains:add welcomerailsapp.example.com
  

  Heroku will output the correct CNAME target you need to use in Weebly’s DNS settings (double-check this matches what you entered earlier).

• Step 3: Update your Rails app’s host whitelist
  In config/environments/production.rb, add your subdomain to the allowed hosts to avoid Rails’ host header security error:

  config.hosts << "welcomerailsapp.example.com"
  

Pros: Super straightforward to set up, no routing conflicts between Weebly and Rails, and both sites operate completely independently.
Cons: Subdomains are treated as separate origins by browsers, so if you need to share user sessions or data between the Weebly site and Rails app, you’ll have to handle cross-domain (CORS) configurations.

This approach feels more integrated, but it’s trickier because Weebly doesn’t natively support reverse proxying requests to external apps like Heroku. You’ll need an intermediate layer to route traffic to your Rails app when the URL matches the subpath. Here’s the most low-maintenance way to do it:

• Step 1: Move your domain’s DNS to a reverse proxy service
  Weebly lets you switch your domain’s DNS servers to a service like Cloudflare (you don’t need to transfer the domain itself, just update the DNS settings in Weebly). This service will handle routing requests to either Weebly or Heroku based on the URL path.

• Step 2: Set up a reverse proxy rule
  In your proxy service’s dashboard, create a rule that forwards all requests to www.example.com/welcomerailsapp/* to your Heroku app’s URL (e.g., https://yourapp.herokuapp.com/*). Make sure to configure path rewriting so that /welcomerailsapp/xyz gets sent to your Rails app as just /xyz—otherwise, your Rails routes won’t match.

• Step 3: Configure your Rails app for the subpath
  You have two options here, depending on whether your proxy rewrites the path:

  1. Scope your routes: Wrap all your Rails routes in a scope block in config/routes.rb:

     scope '/welcomerailsapp' do
       # All your routes go here
       root 'home#index'
       resources :posts
     end
     

  2. Set a relative URL root: If your proxy rewrites the path (removes /welcomerailsapp), add this line to config/environments/production.rb to ensure Rails generates correct URLs:

     config.action_controller.relative_url_root = "/welcomerailsapp"
     

  Don’t forget to add www.example.com to your Rails host whitelist too:

  config.hosts << "www.example.com"
  

Pros: Creates a unified URL structure, making it feel like the Rails app is a natural part of your Weebly site.
Cons: More complex setup, requires a third-party proxy service, and you’ll need to ensure Weebly doesn’t already use the /welcomerailsapp path (check your Weebly site’s page slugs to avoid conflicts).

If you don’t need tight integration or session sharing, go with the subdomain approach—it’s faster to set up and less likely to cause headaches down the line. If you need the Rails app to feel like a seamless part of your main site, the subpath method works, but be prepared to troubleshoot routing and proxy configurations.

内容的提问来源于stack exchange，提问作者mike